fix: improve error handling in API routes and update date handling for OKR and Key Result submissions

src/app/api/teams/[id]/members/route.ts

@@ -28,10 +28,11 @@ export async function POST(request: Request, { params }: { params: Promise<{ id:
     const member = await addTeamMember(id, userId, role || 'MEMBER');
 
     return NextResponse.json(member, { status: 201 });
-  } catch (error: any) {
+  } catch (error) {
     console.error('Error adding team member:', error);
+    const errorMessage = error instanceof Error ? error.message : 'Erreur lors de l\'ajout du membre';
     return NextResponse.json(
-      { error: error.message || 'Erreur lors de l\'ajout du membre' },
+      { error: errorMessage },
       { status: 500 }
     );
   }